60 lines
2.5 KiB
Nix
60 lines
2.5 KiB
Nix
# Given a list of path-like strings, check some properties of the path library
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# using those paths and return a list of attribute sets of the following form:
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#
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# { <string> = <lib.path.subpath.normalise string>; }
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#
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# If `normalise` fails to evaluate, the attribute value is set to `""`.
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# If not, the resulting value is normalised again and an appropriate attribute set added to the output list.
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{
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# The path to the nixpkgs lib to use
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libpath,
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# A flat directory containing files with randomly-generated
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# path-like values
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dir,
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}:
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let
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lib = import libpath;
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# read each file into a string
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strings = map (name:
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builtins.readFile (dir + "/${name}")
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) (builtins.attrNames (builtins.readDir dir));
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inherit (lib.path.subpath) normalise isValid;
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inherit (lib.asserts) assertMsg;
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normaliseAndCheck = str:
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let
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originalValid = isValid str;
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tryOnce = builtins.tryEval (normalise str);
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tryTwice = builtins.tryEval (normalise tryOnce.value);
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absConcatOrig = /. + ("/" + str);
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absConcatNormalised = /. + ("/" + tryOnce.value);
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in
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# Check the lib.path.subpath.normalise property to only error on invalid subpaths
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assert assertMsg
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(originalValid -> tryOnce.success)
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"Even though string \"${str}\" is valid as a subpath, the normalisation for it failed";
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assert assertMsg
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(! originalValid -> ! tryOnce.success)
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"Even though string \"${str}\" is invalid as a subpath, the normalisation for it succeeded";
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# Check normalisation idempotency
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assert assertMsg
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(originalValid -> tryTwice.success)
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"For valid subpath \"${str}\", the normalisation \"${tryOnce.value}\" was not a valid subpath";
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assert assertMsg
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(originalValid -> tryOnce.value == tryTwice.value)
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"For valid subpath \"${str}\", normalising it once gives \"${tryOnce.value}\" but normalising it twice gives a different result: \"${tryTwice.value}\"";
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# Check that normalisation doesn't change a string when appended to an absolute Nix path value
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assert assertMsg
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(originalValid -> absConcatOrig == absConcatNormalised)
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"For valid subpath \"${str}\", appending to an absolute Nix path value gives \"${absConcatOrig}\", but appending the normalised result \"${tryOnce.value}\" gives a different value \"${absConcatNormalised}\"";
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# Return an empty string when failed
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if tryOnce.success then tryOnce.value else "";
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in lib.genAttrs strings normaliseAndCheck
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